Not sure how it ties to your oil change, but it sounds like your running out of fuel/pressure. I know alot of people have been switching to the aeromotive pumps for boosted applications, you might be on that threshold.......then again I could be completley wrong.

The oil change part stubbles me also. I could dump a little more fuel into the motor via my trinity I guess. I can't see how a mostly stock NA motor can pull that much.